1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * Common library for ADIS16XXX devices
5 * Copyright 2012 Analog Devices Inc.
6 * Author: Lars-Peter Clausen <lars@metafoo.de>
9 #include <linux/export.h>
10 #include <linux/interrupt.h>
11 #include <linux/mutex.h>
12 #include <linux/kernel.h>
13 #include <linux/spi/spi.h>
14 #include <linux/slab.h>
16 #include <linux/iio/iio.h>
17 #include <linux/iio/buffer.h>
18 #include <linux/iio/trigger_consumer.h>
19 #include <linux/iio/triggered_buffer.h>
20 #include <linux/iio/imu/adis.h>
22 static int adis_update_scan_mode_burst(struct iio_dev *indio_dev,
23 const unsigned long *scan_mask)
25 struct adis *adis = iio_device_get_drvdata(indio_dev);
26 unsigned int burst_length, burst_max_length;
29 burst_length = adis->data->burst_len + adis->burst_extra_len;
31 if (adis->data->burst_max_len)
32 burst_max_length = adis->data->burst_max_len;
34 burst_max_length = burst_length;
36 adis->xfer = kcalloc(2, sizeof(*adis->xfer), GFP_KERNEL);
40 adis->buffer = kzalloc(burst_max_length + sizeof(u16), GFP_KERNEL);
47 tx = adis->buffer + burst_max_length;
48 tx[0] = ADIS_READ_REG(adis->data->burst_reg_cmd);
51 adis->xfer[0].tx_buf = tx;
52 adis->xfer[0].bits_per_word = 8;
53 adis->xfer[0].len = 2;
54 adis->xfer[1].rx_buf = adis->buffer;
55 adis->xfer[1].bits_per_word = 8;
56 adis->xfer[1].len = burst_length;
58 spi_message_init(&adis->msg);
59 spi_message_add_tail(&adis->xfer[0], &adis->msg);
60 spi_message_add_tail(&adis->xfer[1], &adis->msg);
65 int adis_update_scan_mode(struct iio_dev *indio_dev,
66 const unsigned long *scan_mask)
68 struct adis *adis = iio_device_get_drvdata(indio_dev);
69 const struct iio_chan_spec *chan;
70 unsigned int scan_count;
77 if (adis->data->burst_len)
78 return adis_update_scan_mode_burst(indio_dev, scan_mask);
80 scan_count = indio_dev->scan_bytes / 2;
82 adis->xfer = kcalloc(scan_count + 1, sizeof(*adis->xfer), GFP_KERNEL);
86 adis->buffer = kcalloc(indio_dev->scan_bytes, 2, GFP_KERNEL);
96 spi_message_init(&adis->msg);
98 for (j = 0; j <= scan_count; j++) {
99 adis->xfer[j].bits_per_word = 8;
101 adis->xfer[j].cs_change = 1;
102 adis->xfer[j].len = 2;
103 adis->xfer[j].delay.value = adis->data->read_delay;
104 adis->xfer[j].delay.unit = SPI_DELAY_UNIT_USECS;
106 adis->xfer[j].tx_buf = &tx[j];
108 adis->xfer[j].rx_buf = &rx[j - 1];
109 spi_message_add_tail(&adis->xfer[j], &adis->msg);
112 chan = indio_dev->channels;
113 for (i = 0; i < indio_dev->num_channels; i++, chan++) {
114 if (!test_bit(chan->scan_index, scan_mask))
116 if (chan->scan_type.storagebits == 32)
117 *tx++ = cpu_to_be16((chan->address + 2) << 8);
118 *tx++ = cpu_to_be16(chan->address << 8);
123 EXPORT_SYMBOL_GPL(adis_update_scan_mode);
125 static irqreturn_t adis_trigger_handler(int irq, void *p)
127 struct iio_poll_func *pf = p;
128 struct iio_dev *indio_dev = pf->indio_dev;
129 struct adis *adis = iio_device_get_drvdata(indio_dev);
135 if (adis->data->has_paging) {
136 mutex_lock(&adis->state_lock);
137 if (adis->current_page != 0) {
138 adis->tx[0] = ADIS_WRITE_REG(ADIS_REG_PAGE_ID);
140 spi_write(adis->spi, adis->tx, 2);
144 ret = spi_sync(adis->spi, &adis->msg);
146 dev_err(&adis->spi->dev, "Failed to read data: %d", ret);
149 if (adis->data->has_paging) {
150 adis->current_page = 0;
151 mutex_unlock(&adis->state_lock);
154 iio_push_to_buffers_with_timestamp(indio_dev, adis->buffer,
157 iio_trigger_notify_done(indio_dev->trig);
162 static void adis_buffer_cleanup(void *arg)
164 struct adis *adis = arg;
171 * devm_adis_setup_buffer_and_trigger() - Sets up buffer and trigger for
172 * the managed adis device
173 * @adis: The adis device
174 * @indio_dev: The IIO device
175 * @trigger_handler: Optional trigger handler, may be NULL.
177 * Returns 0 on success, a negative error code otherwise.
179 * This function sets up the buffer and trigger for a adis devices. If
180 * 'trigger_handler' is NULL the default trigger handler will be used. The
181 * default trigger handler will simply read the registers assigned to the
182 * currently active channels.
185 devm_adis_setup_buffer_and_trigger(struct adis *adis, struct iio_dev *indio_dev,
186 irq_handler_t trigger_handler)
190 if (!trigger_handler)
191 trigger_handler = adis_trigger_handler;
193 ret = devm_iio_triggered_buffer_setup(&adis->spi->dev, indio_dev,
194 &iio_pollfunc_store_time,
195 trigger_handler, NULL);
199 if (adis->spi->irq) {
200 ret = devm_adis_probe_trigger(adis, indio_dev);
205 return devm_add_action_or_reset(&adis->spi->dev, adis_buffer_cleanup,
208 EXPORT_SYMBOL_GPL(devm_adis_setup_buffer_and_trigger);